diff --git a/bool_test.go b/bool_test.go
index 3e38a0f..a4319e7 100644
--- a/bool_test.go
+++ b/bool_test.go
@@ -6,7 +6,6 @@
 
 import (
 	"bytes"
-	"fmt"
 	"strconv"
 	"testing"
 )
@@ -48,7 +47,7 @@
 	if *v == triStateMaybe {
 		return strTriStateMaybe
 	}
-	return fmt.Sprintf("%v", bool(*v == triStateTrue))
+	return strconv.FormatBool(*v == triStateTrue)
 }
 
 // The type of the flag as required by the pflag.Value interface
diff --git a/count_test.go b/count_test.go
index 716765c..460d96a 100644
--- a/count_test.go
+++ b/count_test.go
@@ -1,13 +1,10 @@
 package pflag
 
 import (
-	"fmt"
 	"os"
 	"testing"
 )
 
-var _ = fmt.Printf
-
 func setUpCount(c *int) *FlagSet {
 	f := NewFlagSet("test", ContinueOnError)
 	f.CountVarP(c, "verbose", "v", "a counter")
diff --git a/flag.go b/flag.go
index b0b0d46..4258f45 100644
--- a/flag.go
+++ b/flag.go
@@ -416,7 +416,7 @@
 // otherwise, the default values of all defined flags in the set.
 func (f *FlagSet) PrintDefaults() {
 	usages := f.FlagUsages()
-	fmt.Fprintf(f.out(), "%s", usages)
+	fmt.Fprint(f.out(), usages)
 }
 
 // defaultIsZeroValue returns true if the default value for this flag represents